Trying to upload project with Mantaflow to RebusFarm getting error
They're answer is cut and paste.  Of course it should be baked before uploading, and it sounds like thats what you did.  I would double check if there are other Mantaflow settings that need baking as well.  I know for gas sims there is the initial bake and the "noise" bake is separate.  

Also try in the cache section to name your cache and point it to a custom directory instead of just /tmp/  

I also use Rebus and I found that in addition to "pack all files" I need to also check "make all paths absolute" (under the same File>External Data drop down) 

I'm currently testing a Fire + Smoke sim made in 2.82 on their farm at the moment. I'll see if it renders.